Answer: $430,000
Explanation: The amount of wages and salaries paid to employees involved  in the process of production is called direct labor cost. It can be computed as follows :-
Actual total direct labor cost = Standard direct labor cost + unfavorable direct labor rate variance + unfavorable direct labor efficiency variance
                        = $ 400,000 + $ 20,000 + $ 10,000
                        = $430,000